//  Copyright (c) 2017-2018 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package util

import (
	"errors"
	"strings"
)

// RequireNonNull validate a point is not null
func RequireNonNull(pointer interface{}, errMsg string) {
	if pointer == nil {
		panic(errors.New(errMsg))
	}
}

// GetSubstring returns substring embeded in a node's value (substring)
func GetSubstring(str string) string {
	front := strings.Index(str, "(")
	return str[front+1 : len(str)-1]
}

// TrimQuote remove leading and tail quote
func TrimQuote(str string) string {
	if strings.HasPrefix(str, "\"") {
		return strings.Trim(str, "\"")
	} else if strings.HasPrefix(str, "'") {
		return strings.Trim(str, "'")
	}
	return str
}
